Drift-die and matrix for forming grooves in inner surfaces of tubes.



No. 649,34l. Patented May 8, I900.

n. NEVILL. DRIFT DIE AND MATRIX FOB FUR-"m6 GBUUVES "ER SURFACES 0FTUBES. (No Model.) (Apphmm med Oct-30, 1a 3 Sheets-Shoat I. Fig.

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Y I y W No. 649,34I. Patented May 8, I900. H. NEVILL. DRIFT DIEIANDMATRIX FOR FORMING GROIJVES IN INNER SURFACES 0F TUBES.

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Patented May 8, I900;

- No. 649,34l.

H. NEVILL. FORMING GBOOVES IN INNER SURFACES 0F TUBES. (Applicationfiled Oct. 30, 1899.)

DRiFT M AND MATRIX FOR 3 Sheets-Sheet 3,

(No Model.)

Wifnesses.

t TED STATES PATENT OFFICE.

HENRY NEVILL, or SOUTHAMPTON, ENGLANI).

DRIFT-DIE AND MATRIX FOR FORMING GROOVES lN INNER SURFACES OF TUBE S.

SPECIFICATION forming part of Letters Patent No. 649,341, dated May 8,1900.

Application filed October 30, 1899. Serial No. 735,270. (No modelil T0(tZZ 1072 0721, it may concern:

Be it known that I, HENRY NEVILL, manufacturing engineer, a subject ofthe Queen of Great Britain, residing at Aukerwyke, Shirley W'arren,Southampton, England, have in vented certain new and useful Improvementsin Drift Dies and Matrices for Forming Grooves in the Internal Surfacesof Tubes, of which the following is a specification.

My invention has reference to forming grooves or ways in the internalsurfaces of malleable-metal or other malleable or ductile tubes, and hasfor its object to provide a tool whereby the grooves can be formed withgreat accuracy, speed, and economy of time as compared with the timeoccupied in cutting grooves in tubes with tools nowin use. The toolconsists of two parts-a drift-die and a matrix. I attain this object bythe apparatus illustrated in the accompanying drawings, in which--Figure 1 is a vertical elevation of the driftdie. Fig. 2 is a sectionalplan of the driftdie, taken at the line so m, Fig. 1. Fig. 3 isaseotional plan of the drift-die, taken at the line y 'y, Fig. 1. Figs.l, 5, 6, and 7 are elevations of difierent rollers used in the driftdieto form grooves of different section. Fig. 8 is an elevation of thedrift-die which I use to finish the grooves after being formed by thedrift-die shown in Fig. 1. Fig. 9 is a sectional plan of the drift-dieshown in Fig. 8. Fig. 10 is a sectional plan of a modified form of thedrift-die shown in Fig. 8. Fig. 11 is a vertical section of the matrixbolster and holder for use with the drift-die. Fig. 12 is a sectionalplan of the matrix bolster and holder, taken at the line 2 .2 Fig. 11.

Similar letters refer to similar parts th rou ghout the several views.

According to this invention I provide the drift-die with a disk-shapedroller or a ribformer the edge of which corresponds in shape to the formof groove or flute required to be made in the tube and projects for therequired distance beyond the surface of the shank of the drift-die. Thedrift-die may have one or more of these rollers or ribs. In the case ofthe rollers they are mounted on spindles and revolve in a slot or slotsin the drift-die.

The drift-die works in a grooved cylindrical matrix-bolster of internaldiameter to receive the tube to be grooved or fluted.

WVith reference to the drawings, a desigdates the shank of thedrift-die, and b the head-piece by which it is driven or pressed by asuitable power or hydraulic press into the tube and matrix.

0 denotes the roller or rib by which the groove or flute is formed inthe tube. The roller 0 is mounted on a spindle and revolves in a slot inthe shank a. The edge of the roller or rib is round or rectangular, asshown in Figs. 4. and 5, or shaped as shown in Figs. 6 and '7.

Below the roller 0 and on the opposite side of the drift there isprovided an antifriction-roller d, as shown in dotted lines, or a steelplate d may be let into the shank a. This roller or plate 01 bears onthe side of the tube opposite to that on which the groove is beingformed. 7

e denotes the matrix-bolster, and h the grooves therein. These groovescorrespond to the extreme number and depth of the grooves or flutes tobe formed in the tube.

t' denotes the tube in which the grooves are to be formed.

The matrix-bolster c has an internal flange at'the top, which projectspartly over the metal of the tube, and an external flange by which it isheld in an adjustable block 70, which is provided with a screw-block Z,which secures the bolster, and with a screw-block m, which holds andsecures the tube 2'. The block 7c is carried or supported in the pressby the bars n, which are provided with a stopbolt 1), which takes intoholes q, formed in the block 70, which holes correspond with the groovesh in the matriX-bolsteia. v

.9 denotes handle-bolts by which the block 7c and matrix 6 can be movedaround to bring the tube i into position for the roller 0 of thedrift-die a to form the successive grooves in the tube 1'.

In operation the tube t' to be grooved or fluted is placed in thematrix-bolster e, which has first been secured in the block by thescrew-block Z. a power or hydraulic press, in which it is supported bythe bars at. The drift-die ct is then fixed to the plunger of theprcssand inserted The block 7c is then placed in in line with the roller 0,and a groove corre- 1 sponding in shape to the edge of the roller isformed in the tube. After the groove has been formed in the tube 11 thedrift-die is withdrawn, and the block is, with the matrix e, is turnedto bring another groove h opposite the roller 0, and a second groove isformed in the tube, and the operation is repeated until the requirednumber of grooves have been formed in the tube 2'. After all the grooveshave been formed the roller drifit-die is removed from the press, and adrift-die having a uumberof ribs corresponding to the number :of groovesisforced by the press into thetnibe i. This operation truesand finishesthe grooves made by the roller 0.

The grooves or flutes are formed in the tube one at a time when thedri'fit-die has one disk roller-tool, and when the drift-die has two ormoredisk roller-toolsa corresponding number of grooves or flutes areformed .at one stroke. Also the groove or grooves may extend only partlythrough or entirely through the tube, and the operation maybe perfiormedwith the tube either in a cold or hot state.

A driftdie and matrix according :to my invention is particularlyapplicable for forming multiple grooves on the innersurface of tubes Ito vtor-m 'hngiitud'inal hall-races for ball-bearings, also for formingkeyways in the inner surfaces of tubes, and the use of the tool en- Iables the groove to be formed with great accuracy and economy of time ascompared.

with the time occupied in cutting grooves with tools now in use.

Mydrift-die is adapted to operate upon the interior surface of the tube,the roller or- ,rollers forcing the metal outward into the I-Ieretoforeand prior to my invention tubes have been grooved by external rollingcorrugators which pressed the metal inward toward the-centerof the tube,thereby reducing the interior area of the tube. I make no claim .to anysuch construction.

What I claim, and desire to secure by Let= ters Patent, is- I 1. In themanufacture of metallic tubing, the com'binationwith a drift-dieconsisting of va :szhank' ha'vi-ng one or more rolls, each jour naled ina slot in the shank and projecting from said slot at a single point, ofa matrix having a cylindrical opening to receive the tube, said openingbeing provided with grooves in its internal ilace, which grooves receivethe OlliiWMdlY-lfiQROGd metal of the tube which is driven into them bythe driftdie, substantially as described.

2. In the manufacture .of metallic tubing the combination with adrift-die, consisting of a shank having one or more rolls, eachjournaled in a separate .diametrical slot andpro ,jecting therefrom uponone sideot t-heshank, an antifiriction-plate bei n g secured $0 theopposite side, of a matrix having a cylindrical opening provided withone .or more longitudinal grooves to receive the metal of the tubeforced outward by the drift die acting in the interior of the tube,substantially as de scribed.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit nesses.

HENRY NEVILL.

Witnesses FREDERICK J. .CHEESBROUG'H, ARTHUR JAMES LEA.

